The Impact of a Reduced High-wind Charnock Parameter on Wave Growth With Application to the North Sea, the Norwegian Sea and the Arctic Ocean
As atmospheric models move to higher resolution and resolve smaller scales, the maximum modeled wind speed also tends to increase. Wave models tuned to coarser wind fields tend to overestimate the wave growth under strong winds. A recently developed semi-empirical parameterization of the Charnock pa...
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ftdatacite:10.48550/arxiv.2203.07188 2023-05-15T15:13:10+02:00 The Impact of a Reduced High-wind Charnock Parameter on Wave Growth With Application to the North Sea, the Norwegian Sea and the Arctic Ocean Breivik, Øyvind Carrasco, Ana Haakenstad, Hilde Aarnes, Ole Johan Behrens, Arno Bidlot, Jean-Raymond Björkqvist, Jan-Victor Bohlinger, Patrik Furevik, Birgitte R Staneva, Joanna Reistad, Magnar 2022 https://dx.doi.org/10.48550/arxiv.2203.07188 https://arxiv.org/abs/2203.07188 unknown arXiv https://dx.doi.org/10.1029/2021jc018196 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Atmospheric and Oceanic Physics physics.ao-ph FOS Physical sciences article-journal Article ScholarlyArticle Text 2022 ftdatacite https://doi.org/10.48550/arxiv.2203.07188 https://doi.org/10.1029/2021jc018196 2022-04-01T14:50:22Z As atmospheric models move to higher resolution and resolve smaller scales, the maximum modeled wind speed also tends to increase. Wave models tuned to coarser wind fields tend to overestimate the wave growth under strong winds. A recently developed semi-empirical parameterization of the Charnock parameter, which controls the roughness length over surface waves, substantially reduces the aerodynamic drag of waves in high winds (above a threshold of 30 m/s). Here we apply the formulation in a recent version of the wave model WAM (Cycle 4.7), which uses a modified version of the physics parameterizations by Ardhuin et al (2010) as well as subgrid obstructions for better performance around complex topography. The new Charnock formulation is tested with wind forcing from NORA3, a recently completed non-hydrostatic atmospheric downscaling of the global reanalysis ERA5 for the North Sea, the Norwegian Sea and the Barents Sea. Such high-resolution atmospheric model integrations tend to have stronger (and more realistic) upper-percentile winds than what is typically found in coarser atmospheric models. A two-year comparison (2011-2012) of a control run against the run with the modified Charnock parameter shows a dramatic reduction of the wave height bias in high-wind cases. The added computational cost of the new physics and the reduction of the Charnock parameter compared to the earlier WAM physics is modest (14%). A longer (1998-2020) hindcast integration with the new Charnock parameter is found to compare well against in situ and altimeter wave measurements both for intermediate and high sea states. : 38 pages, 9 figures plus 5 appendix figures Text Arctic Arctic Ocean Barents Sea Norwegian Sea DataCite Metadata Store (German National Library of Science and Technology) Arctic Arctic Ocean Barents Sea Norwegian Sea |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Atmospheric and Oceanic Physics physics.ao-ph FOS Physical sciences |
spellingShingle |
Atmospheric and Oceanic Physics physics.ao-ph FOS Physical sciences Breivik, Øyvind Carrasco, Ana Haakenstad, Hilde Aarnes, Ole Johan Behrens, Arno Bidlot, Jean-Raymond Björkqvist, Jan-Victor Bohlinger, Patrik Furevik, Birgitte R Staneva, Joanna Reistad, Magnar The Impact of a Reduced High-wind Charnock Parameter on Wave Growth With Application to the North Sea, the Norwegian Sea and the Arctic Ocean |
topic_facet |
Atmospheric and Oceanic Physics physics.ao-ph FOS Physical sciences |
description |
As atmospheric models move to higher resolution and resolve smaller scales, the maximum modeled wind speed also tends to increase. Wave models tuned to coarser wind fields tend to overestimate the wave growth under strong winds. A recently developed semi-empirical parameterization of the Charnock parameter, which controls the roughness length over surface waves, substantially reduces the aerodynamic drag of waves in high winds (above a threshold of 30 m/s). Here we apply the formulation in a recent version of the wave model WAM (Cycle 4.7), which uses a modified version of the physics parameterizations by Ardhuin et al (2010) as well as subgrid obstructions for better performance around complex topography. The new Charnock formulation is tested with wind forcing from NORA3, a recently completed non-hydrostatic atmospheric downscaling of the global reanalysis ERA5 for the North Sea, the Norwegian Sea and the Barents Sea. Such high-resolution atmospheric model integrations tend to have stronger (and more realistic) upper-percentile winds than what is typically found in coarser atmospheric models. A two-year comparison (2011-2012) of a control run against the run with the modified Charnock parameter shows a dramatic reduction of the wave height bias in high-wind cases. The added computational cost of the new physics and the reduction of the Charnock parameter compared to the earlier WAM physics is modest (14%). A longer (1998-2020) hindcast integration with the new Charnock parameter is found to compare well against in situ and altimeter wave measurements both for intermediate and high sea states. : 38 pages, 9 figures plus 5 appendix figures |
format |
Text |
author |
Breivik, Øyvind Carrasco, Ana Haakenstad, Hilde Aarnes, Ole Johan Behrens, Arno Bidlot, Jean-Raymond Björkqvist, Jan-Victor Bohlinger, Patrik Furevik, Birgitte R Staneva, Joanna Reistad, Magnar |
author_facet |
Breivik, Øyvind Carrasco, Ana Haakenstad, Hilde Aarnes, Ole Johan Behrens, Arno Bidlot, Jean-Raymond Björkqvist, Jan-Victor Bohlinger, Patrik Furevik, Birgitte R Staneva, Joanna Reistad, Magnar |
author_sort |
Breivik, Øyvind |
title |
The Impact of a Reduced High-wind Charnock Parameter on Wave Growth With Application to the North Sea, the Norwegian Sea and the Arctic Ocean |
title_short |
The Impact of a Reduced High-wind Charnock Parameter on Wave Growth With Application to the North Sea, the Norwegian Sea and the Arctic Ocean |
title_full |
The Impact of a Reduced High-wind Charnock Parameter on Wave Growth With Application to the North Sea, the Norwegian Sea and the Arctic Ocean |
title_fullStr |
The Impact of a Reduced High-wind Charnock Parameter on Wave Growth With Application to the North Sea, the Norwegian Sea and the Arctic Ocean |
title_full_unstemmed |
The Impact of a Reduced High-wind Charnock Parameter on Wave Growth With Application to the North Sea, the Norwegian Sea and the Arctic Ocean |
title_sort |
impact of a reduced high-wind charnock parameter on wave growth with application to the north sea, the norwegian sea and the arctic ocean |
publisher |
arXiv |
publishDate |
2022 |
url |
https://dx.doi.org/10.48550/arxiv.2203.07188 https://arxiv.org/abs/2203.07188 |
geographic |
Arctic Arctic Ocean Barents Sea Norwegian Sea |
geographic_facet |
Arctic Arctic Ocean Barents Sea Norwegian Sea |
genre |
Arctic Arctic Ocean Barents Sea Norwegian Sea |
genre_facet |
Arctic Arctic Ocean Barents Sea Norwegian Sea |
op_relation |
https://dx.doi.org/10.1029/2021jc018196 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.2203.07188 https://doi.org/10.1029/2021jc018196 |
_version_ |
1766343752541011968 |